One of the first things I checked was for vacuum leaks but I couldn't find any. The package was removed from a running car so in theory it should all just run, right?

I've had a but more tinkering around since my last post and have since gotten it to run and drive although it feels down on power probably because of the below.
To get it running I advanced the cam timing a tooth, wound out the idle screw so it only just idles at like 600rpm when warm (which is meant to be all the way in on the KR injection system) and unplugged the overrun cutoff value and the vacuum switch from the vacuum system as they made the car run way rougher.
I advanced the cam a tooth (cause that's how it was set when I got it) but the distributor still wants to advance more and the flywheel timing marks wont line up which is a bit weird. You can't even see the flywheel timing mark with everything lined up where it should be.
My theory at the moment is that the ISV controller isn't working quite right which I'm not even certain on that. The ISV 'buzzes' as it should but doesn't seem to do anything when you pinch the lines to it, nor does the overrun cutoff value or the vacuum switch next to it. I've probed all the leads on the controllers circuit on it and it appears to be getting power to all the correct places when you click the throttle switch etc so at the moment, I'm very stuck and not even certain on that either now...